Drill-head



APPLICATION FILED MAY 10. I920 Reissued June 14, 1921.

UNITED STATES CLARENCE E. REED, OF HOUSTON, TEXAS.

DRILL-HEAD.

Specification of Reissued Letters Patent. Reigs d J 14 1921 Original No. 1,279,759, dated September 24, 1918, Serial No. 238,828, filed June 5, 1918. Application for reissue filed Kay 10, 1920. Serial No. 880,309.

T 0 all whom it may concern:

Be it known that I, CLARENCE E. REED, a citizen of the ['nited States, and residing at Houston,'in the county of Harris and State of Texas, have invented certain new and useful Improvements in Drill-Heads, of which the following is a specification.

My, invention is an improvement in the general type of drill for drilling wells shown for instance in Letters Patent of the I'nited States. No. 1.120,198, December 8th, 191- granted to Humason, and my invention concerns particularly the mounting of the journal pin on which the side cutters turn.

The invention is shown in the accompanying drawing which represents a vertical sectional view of the drill head.

This type of drill has cutters 1 arranged in recesses '2 extending upwardly and inwardly at an inclination or toward the vertical axis of the drill head, and the drill head has a central space 3 in which the main cutter 4 is located.

The cutters 1 turn about journal pins 5 which are fixed in the walls 6 and 7, defining the inner and outer sides of the slots 2.

hese pins have conical heads 5' and screw-threaded ends 5" and in the improved arrangement I place the pins in position by inserting them from the recess 3 outwardly instead of inserting them from the outer side of the head. and of course the pins are placed before the main cutter member is positioned.

The wall 6 at the inner side of the slot 2 is provided'with a conical seat for receiving the conical head 8 of the pin and the outer wall 7 of the recess is screw-threaded to receive the screw-threaded end of the pin.

In some prior constructions in which the pin was inserted from' the outside of the drill head it has been customary to employ some safety device at the outer or headed end of the pin, such as a screw or pin to prevent the bearing pin from working out of place, but with my arrangement the in cannot work out of-place or dropout ecause of the presence of the main cutter, which extends across the inner headed end of the pin with its periphery working close thereto. Further the space at the outer hearing wall 7 which heretofore has been occupied by the safet device is with my ar- 66 rangement availa 1e for to receive the screw-threaded end of thepin, and this, together with the extra thickness of the outer wall '7 in relation to the inner wall 6 gives a longer threaded seat to receive the threaded end of the pin than is possible under the old arrangement and thus a stronger tie is provided between these walls 6 and 7, and one which will be maintalned because as above stated the pin c annot work out of place, this being prevented by the main cutter working close to the inner headed end of the pin. Further the beveled head of the pin having a wider bearng contact with the thin inner wall 6 than is possible with a threaded connection acts to better sustain this wall and make amore rellable support to take the strains than under previous constructions in which the threaded end of the pin finds a comparatively short bearing in the said wall only a. few threads being available.

" lVith my improvement even thou h a ournal pin might break the cutter wi not be lost in the well for the reason that the pieces of the pin would still be held in place and thus retain the cutter, though of course the cutter might, not function as intended and repairs would have to be inade.

on a straight line at the inner walls of the slot would be necessary to permit the cutter to drop out of the recess, and this is a ossibility which is most remote as the everage would cause the pin to break first near the wall of the slot nearest the axis of the drill head, and then the cutter would have enough play or lateral movementto prevent shearing the pin near the outer wall of the slot prior to the bit being withdrawn from the well. 1 I

What I claim is:

1. A drill having a head with a central recess and laterally disposed slots, rotary cutters in the slots. a main cutter in the central recess and journal pins for the rotary cutters extending across the slots and having their heads bearing against the inner walls of the slots adjacent the central cutter. and their outer ends bearin in the outer walls of the slots, said pins eing in serted into lace through the central recess of the drill ead. substantially as described.

2. A drill having a head with a central recess and laterally disposed slots, rotary cutters in the slots, a main cutter in the cen- I a ing their heads bearing in the inner wallsof the slots adjacent the central cutter, and

7 place through the central recess of the drill threaded into said outer walls, substantially q as described. a a 4 bearing a into position through said first named recess,

coiiperatm f tral recess and journal, pins for the rotary cutters extending across the slots and havtheir outer ends bearing in the outer walls of the slots, said pins being inserted into ead, said gin heads being of frusto-conical form and tting corresponding seats in the said inner walls and havingtheir outer ends 3. In a tool for deep well drilling, ahead having means at the upper end thereof for attachment to'a drill stem, a transverselyextending'recess in the lower end thereof opening out through the bottom of the same, and a second recess located between one of the longer sides of the first named recess and the riphery of the head, a disk cutter locate in thesecond recess, a retaining and pin for the disk cutter insertible surfaces associated with the outer portion of the pin and the wall between the second recess and the periphery of the head for, retaining the pin in posision, and a member adapted to be placed and held within the first named recess, in

icoiiperative relation to the pin, after the latter hasrfbeen inserted in position.

i 4; a tool for deep 'well drilling-a head having means at the upper end thereoffor attachment to a drill stem, a transversely extending I recess in the lower end thereof periphery of the head, and registering openings located respectively inthe wall be tween -the transverse recess and the second J ,"and between the latter and the peri h i of the head materially Ellie r anthe wall betwecn theQs .ano

locate 'riphei'yof the head, the axes of which ex tend upwardly and outwardly, a disk cutter in the second recess, a retaining and bearing pin for the disk cutter having its end portions finding bearings in said openings and, insertible in place through said transverse recess and a member placed and held-w thin the'- transverse recess in cooperative relationto'the pin after the latter has been inserted in position.

5. In atool'for deep well arminga' head having means at the upper end thereoffor attachment to a drill stem, a-recess in the lower end thereof opening out thro "bottom of'the same, a second recess ocated between-the-first named recess and the pe miphery ofthe head, the middle portion of h the the wall the. seoondrecess and the .1 in the middle wall and'an unt cated. in the second recess and 'a retaining and bearingpin therefor insertible inplace through the first named recess and having an upper threa ed end portion cooperating with the threads of the first named open portion of the first named readed'registering openingin the second named wall, a disk cutter 10-,

ing, and an opposite end portion cooperating with the we 1 of the second named openin and cutting I members positioned and he d in the first named recess after the pin has been inserted in position.

6. In a tool for deep well drilling, a head having in its lower end a recess opening out a through the bottom thereof and a second re-* cess located. between the first named recess and the periphery of the head, the wall between the two recesses bein thinner than the middle portion of the wal between the sec- 0nd recess and the periphery of the heady-u,

the first named wall having anopening extending therethrough'and thesecond wall 1. being provided with an alining o ening, a ortion of the wall of .the seconc iopening: eing threaded, -a disk cutter located in the second recess, a retaining andbearing pin therefor insertible in place through the first named i'ecess' andhaving a threaded end portion engaging the tlireaded'part of the e p p l ea 'ns' for limiting the outwardmovement bofthe pin, and a meminsertible and held in the first named recess after the insertion of saidpin and in "cooperative relation to the inner end of the latter for-arresting the inward movement ofthe pin.. I

7. In a tool for deep wellldrilling, a head having in its lower end a recess opening out through the bottom thereof and a sec ond recess'located between the first named L I of h e n p n n ie ad havingiitsf -v cpposite end a portion c'oi ijperatlng with the ifirst namedopeningp' recess and the periphery of the head. the wall between the two recesses being thinner than the middleP rtion of thewa-ll between the second recess and the periphery of the head, the first named wall avlng an opening extending therethrough and the second wall bein provided with analining'o en-' ing a di cutter located .in'the secon recess, a retaining and bearing pin therefor insertible in placethrough t e first named recess and having end portions supported in said so nings," cooperating surfaces on the secon wallrand pin. for limiting the. out

ward movement. thereof and a member insertible and held within first named recess afterthe'insertion of the pin and in co6parrest inward v erative relation therewith to movement of the, same; 7

, In testimony whereof, I aflix" my signature. "1 i i CLARENCE E,-REED. 

